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Method for preparing haematochrome of red rice

A technology of red rice red and pigment, applied in the field of natural pigment production, can solve the problems of low unit color price, poor water solubility, poor stability, etc., and achieve the effect of high color price, good stability and good water solubility.

Active Publication Date: 2010-05-26
CHENGUANG BIOTECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are that the product has a large loss of inherent components, low unit color price, poor stability, and poor water solubility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Add citric acid with a concentration of 0.3% to the edible ethanol with a concentration of 45% to adjust the pH to 3.0 as an extractant. Add the extractant to 100 kilograms of northeast black fragrant rice, extract three times, each time the weight ratio of northeast black fragrant rice and extractant is 1:2, 1:1, 1:1 respectively, and the extraction time is 2 hours . The extracts were combined to obtain 400 L, the extracts were concentrated by falling film evaporation to 1 / 5 of the original volume, 95% ethanol was added to adjust the ethanol content to 75%, and the ethanol content was adjusted to 75% at 4°C for 3 hours to remove impurities by alcohol precipitation. The centrifuge was centrifuged at 3000rpm to collect the filtrate. The filtrate is concentrated using a falling film evaporator until no solvent remains, with a flow rate of 300L / h and a vapor pressure of 0.05MPa to obtain high-quality red beige pigment.

example 2

[0012] Add citric acid with a concentration of 0.3% to the edible ethanol with a concentration of 40% to adjust the pH to 3.0 as an extractant. Add described extraction agent in 200 kilograms of northeast black fragrant rice, extract three times, each time the weight ratio of northeast black fragrant rice and extractant is respectively 1: 2, 1: 2, 1: 1, and extraction time is respectively 3, 2. 1 hour. The extracts were combined to obtain 1000L, and the extracts were concentrated to 1 / 6 of the original volume by falling film evaporation, 95% ethanol was added to adjust the ethanol content to 80%, and the ethanol content was adjusted to 80% at 4°C for 3 hours to remove impurities by alcohol precipitation. The centrifuge was centrifuged at 3000rpm to collect the filtrate. The filtrate is concentrated using a falling film evaporator until no solvent remains, with a flow rate of 200L / h and a vapor pressure of 0.05MPa to obtain high-quality red beige pigment.

example 3

[0014] Add citric acid with a concentration of 0.3% to the edible ethanol with a concentration of 30% to adjust the pH to 3.0 as an extractant. Add described extraction agent in 500 kilograms of northeast black fragrant rice, extract three times, each time the weight ratio of northeast black fragrant rice and extractant is respectively 1: 3, 1: 2, 1: 1, and extraction time is respectively 3, 1.5, 1.5 hours. The extracts were combined to obtain 2500L. The extracts were concentrated by falling film evaporation to 1 / 8 of the original volume, 95% ethanol was added to adjust the ethanol content to 80%, and the alcohol precipitation was carried out at 4°C for 5 hours to remove impurities. The centrifuge was centrifuged at 3000rpm to collect the filtrate. The filtrate is concentrated using a falling film evaporator until no solvent remains, with a flow rate of 300L / h and a vapor pressure of 0.08MPa to obtain high-quality red beige pigment.

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Abstract

The invention relates to a method for preparing haematochrome of red rice, which belongs to the technical field of the production of natural pigments. The method comprises the following steps of: (1) preparing an extracting agent, namely adding 0.3 percent citric acid into 15 to 45 percent food grade ethanol to adjust the pH of the ethanol to between 2.5 and 3.8, and using the mixture as the extracting agent; (2) performing extraction, namely mixing black scented rice with the extracting agent in a weight ratio of 1:1-5, performing the extraction for 1 to 3 hours at the temperature of 40 DEG C, repeating the operations for 2 to 3 times, and then combining extraction liquid; (3) performing ethanol treatment, namely concentrating the extraction liquid by using a falling film evaporator until the volume of the extraction liquid is 1 / 5 to 1 / 8 of the original volume, adding 95 percent ethanol, adjusting the ethanol content to between 65 and 80 percent, standing the mixture for 3 to 5 hoursat the temperature of between 0 and 5 DEG C, depositing the mixture in alcohol to remove impurities, then filtering the mixture by using a centrifugal machine, and collecting filtrate; and (4) performing concentration, namely concentrating the filtrate by using the falling film evaporator. The product keeps the inherent components to the utmost extent, and has high unit color scale, good stability and good water solubility.

Description

technical field [0001] The invention relates to a preparation method of red beige pigment, which belongs to the technical field of natural pigment production. Background technique [0002] The color of food can increase people's appetite. The pigments used in food are divided into two categories: synthetic pigments and natural pigments. Natural pigments are highly safe, non-toxic and side effects, and have nutritional and health benefits, so they have become the main direction of the development of the pigment industry. [0003] Red beige red pigment is a natural food coloring extracted from grass black rice. Its main component is cyanidin-3-glucoside, which belongs to anthocyanin pigment. Widely used in the coloring of ice cream, candy, wine, chocolate, pickled fruit, etc. At present, the more popular preparation method is to use acidic ethanol extraction, and then obtain red beige pigment through resin adsorption, concentration and other processes. Its disadvantages ar...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 连运河齐立军安晓东昝立峰
Owner CHENGUANG BIOTECH GRP CO LTD
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